Alarm-clock.



W. E. PORTER.

ALARM CLOCK.

APPLICATION FILED AUG.21, 1915.

Patented Sept. 18 1917.

- "UNITED, STATES PATENT oEEICE.

wILsON E. PORTER, OFQNYEWV HAVEN, CONNECTICUT, ASSIGNOB, To NEW HAVEN CLOCK 00. OF NEW'HAVEN. CONNECTICUT, A CORPORATION.

ALARM-CLOCK.

To all whom it may concern Be itknown that 1, WILSON E. PORTER, a citizen of the United States, residing at New Haven, in the county of New Haven and State of Connecticut, have invented a new and useful Improvement in Alarm- Clocks; and I do hereby declare the following, when taken in connection with the accompanying drawings and the characters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this apphcation, and represent, in

Figure 1 a view in front elevation of an alarm clock constructed in accordance with my invention.

Fig. 2 a detached view of the clock-movement in front elevation with the dial and hands and pointer removed.

Fig. 3 a view thereof in side elevation with the running parts removed except those in front of the front movement-plate.

Fig. 1 a detail view in vertical central section of portions of the alarmmechanism.

One of. the difliculties connected with the use of an alarm clock as commonly constructed, is, that the user has had no way of determining at any given time whether the alarm-mechanism is, so to speak, in the first twelve-hour phase or. in the second twelvehour phase of the twenty-four hour alarm interval, with respect to the going off of, or sounding of the alarm. To make sure that the alarm-mechanism is properly set, as well as to set or to reset the alarm, the user of the clock is now obliged to turn the hands of the clock until the alarm goes Off, to show him its phase of operation, or, as the case may be, to give him a starting point, from which to set or reset the alarm- Without this precaution of turning the hands around to test out the running phase of the alarmmechanism, the alarm may go off in the wrong phase, as, for instance, at 5.30 P. M. instead of 5.30 A. M.

The object of my present invention is to provide an alarm clock with means for showing its user whether or not he can depend upon it to go off as set, in the A. M. or in the P. M.

v lVith these ends in view, my invention conin an alarm clock having certain details of construction and combinations of parts as will be hereinafter described and pointed out in the claims.

Specification of Letters Patent. Patented Sept, 18,1917, Application filed August 21, 19.15. Serial No. 46,505. I

In carrying out my invention as herein shown, I employ an alarm-hand 2 which for want of a better term, I shall hereafter designate as the A. M. and P. M. alarm-hand.

The said hand 2 is arranged to sweep over I a non-concentric alarm-dial 3 imposed upon the time-dial a and located directly above the center thereof, the said alarm-dial hav ing two sets of figures running from 1 to 12- which divide it into the A. M. and P. M. divisions of the day, and these divisions being indicated upon the dial by A. M. and P. M. placed diametrically opposite each other on a horizontal line. The said A. M. and P. M. alarm-hand 2 is located at the outer end of the hub 5 of a wheel 6 turning loosely on a manually operable alarm-set sta if or arbor 7 having bearing in the front and rear movement-plates 8 and 9 and furnished at its projecting rear end with a tinger button 10, and at its projecting forward end with an alarm-setting pointer 11 which also sweeps over the alarm-dial 3. The wheel 6 aforesaid is driven by a dial-pinion 12 wl ich for this purpose is made wide enough to be intermeshed, not only by the h our-wheel. 13, but also by the wheel 6 aforesaid and the alarm-cam wheel 1-1. The said dial-pinion 12 is carried by a dial-wheel 15 which meshes into a cannon-pinion 16 staked to the center-arbor 17, also bearing in the plates 8 and 9 and furnished at its rear end with a finger-button 18. At its forward end, the arbor 17 carries the minute-hand 19 which sweeps over the time-dial 4, the hour-hand 20 being applied to the socket 21 of the socket or hour-wheel 13. The alarm cam wheel 14 aforesaid is mounted upon a hub 22 loosely mounted, and laterally movable upon the arbor 7 and formed upon its forward end with an alarm-cam 23 the edge of which co-acts with a finger 24 projecting from a collar 25 staked upon the arbor 7. A spring 26 interposed between the plate 8 and the rear end of the hub 22, provides for moving the hub 22, wheel 14 and cam 23 forward upon the arbor 7 It will be understood from the foregoing that the A. M. and P. M. alarm-hand 2 is continuously driven by the time-mechanism of the clock and synchronously with the minute and hour-hands 19 and 20, with the difference that the hand 2 tells the time of day or night upon the alarm-dial 3, while the hands 19 and tell the time from 1 to 12 upon the time-dial 4, Without giving any indication of whether the time marked is day time or night time, A. M. or P. M.

In the use of my improved clock, the user by glancing at the hand 2 will be told Whether the alarm will go off at the hour set in the A. M. or in the P. M., Without being obliged to test out the clock for the purpose of securing this information. If he finds by glancing at the hand 2, that the alarm is going off in the P. M. instead of in the A. M., or vice versa, he must manually turn the center-arbor 17 by its fingerbutton 18 until the hand 2 correctly indicates on the dial 3 the then correct time of day or night.

I claim In an alarm clock, the combination with a time-dial, of a stationary, non-concentric alarm-dial imposed thereupon, an alarm-set; ting pointer sweeping over the said alarm.- dial, a manually operable alarm-setting arbor mounting the said pointer, a 24 hour alarm-cam wheel turning and sliding loosely on the said arbor, a 24 hour alarm-hand Wheel turning loosely upon the said arbor in a fixed plane, an A. M. and P. M. alarmhand carried by the said 24 hour alarm-hand wheel and also turning in a fixed plane, an hour-Wheel, and a dial-pinion driven by the time-mechanism of the clock and ada ed in length to be meshed into and to drive the said hour-wheel, the said alarm-hand wheel,

and the said alarm-cam wheel.

WILSON E. PORTER.

copies of this patent may be obtained 101'. five cents each, by addressing the Commissioner 01 Patent, Washington, D. 0. 

